G3F-PB80-JGF datasheet(13/36 Pages) MAGNETROL

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46-624 Series 3 Liquid Level Switches ASME B31.1 Construction

4.2

What To Do — Every 12 Months (minimum)

4.2.1 Switch Corrosion Inspection

For every 12 months in service, conduct the following

maintenance and inspection checks in addition to cus-

tomer specific or code requirements.

NOTE: Conduct this inspection every 3 months for applications

where the switches are exposed to corrosive environments.

1. Disconnect power to the switch.

2. Remove switch housing cover to inspect switch mecha-

nisms for visible signs of corrosion on terminals and wires.

NOTE: When removing switch housing cover, secure housing base to

prevent rotation of the base and enclosing tube. If cover

proves difficult to remove, loosen housing base set screws

before using a crossbar to free the cover. Loosening the set

screws will prevent accidental rotation of the enclosing tube

and possible leakage of process media.

3. Dry contact switches should be inspected for excessive

wear on actuating lever or misalignment of adjustment

screw at point of contact between screw and lever. Such

wear can cause false switch actuating levels. Adjust switch

mechanism to compensate (if possible) or replace switch.

4. Controls may sometimes be exposed to excessive heat or

moisture. Under such conditions, insulation on electrical

wiring may become brittle, eventually breaking or peeling

away. The resulting bare wires can cause short circuits.

Check wiring carefully and replace at the first sign of

brittle insulation.

5. Vibration may sometimes cause terminal screws to loosen.

Check all terminal connections to be certain that screws

are tight. Refer to Figure 15.

6. Conduct a continuity test for switch contacts, using a low

voltage DC circuit with an indicator.

7. Switches that are corroded or that failed the contact conti-

nuity test should be replaced. DO NOT operate your

control with defective or maladjusted switch mechanisms

(refer to bulletin on switch mechanisms furnished for

service instructions.)

8. Verify that switch housing cover and conduit seal are

properly closed after each inspection of the switch

mechanism(s).

NOTE: In applications with presence of salt-laden air or corrosive

vapors, contact Magnetrol for possible alternate switch

mechanisms.

Mechanism

clamping screw

Terminal screws

Figure 15

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